/*
 * Cppcheck - A tool for static C/C++ code analysis
 * Copyright (C) 2007-2015 Daniel Marjamki and Cppcheck team.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */


#include "tokenize.h"
#include "checkstring.h"
#include "testsuite.h"
#include "preprocessor.h"
#include "testutils.h"
#include 

extern std::ostringstream errout;

class TestString : public TestFixture {
public:
    TestString() : TestFixture("TestString") {
    }

private:

    void run() {
        TEST_CASE(alwaysTrueFalseStringCompare);
        TEST_CASE(suspiciousStringCompare);
        TEST_CASE(suspiciousStringCompare_char);

        TEST_CASE(strPlusChar1);     // "/usr" + '/'
        TEST_CASE(strPlusChar2);     // "/usr" + ch
        TEST_CASE(strPlusChar3);     // ok: path + "/sub" + '/'
        TEST_CASE(strPlusChar4);     // ast

        TEST_CASE(sprintf1);        // Dangerous usage of sprintf
        TEST_CASE(sprintf2);
        TEST_CASE(sprintf3);
        TEST_CASE(sprintf4);        // struct member

        TEST_CASE(incorrectStringCompare);
    }

    void check(const char code[], const char filename[] = "test.cpp") {
        // Clear the error buffer..
        errout.str("");

        Settings settings;
        settings.addEnabled("warning");
        settings.addEnabled("style");

        // Tokenize..
        Tokenizer tokenizer(&settings, this);
        std::istringstream istr(code);
        tokenizer.tokenize(istr, filename);

        // Check char variable usage..
        CheckString checkString(&tokenizer, &settings, this);
        checkString.runChecks(&tokenizer, &settings, this);

        tokenizer.simplifyTokenList2();
        checkString.runSimplifiedChecks(&tokenizer, &settings, this);
    }

    void check_preprocess_suppress(const char precode[]) {
        // Clear the error buffer..
        errout.str("");

        Settings settings;
        settings.addEnabled("warning");

        // Preprocess file..
        Preprocessor preprocessor(&settings, this);
        std::list configurations;
        std::string filedata;
        std::istringstream fin(precode);
        preprocessor.preprocess(fin, filedata, configurations, "test.cpp", settings._includePaths);
        const std::string code = preprocessor.getcode(filedata, "", "test.cpp");

        // Tokenize..
        Tokenizer tokenizer(&settings, this);
        std::istringstream istr(code);
        tokenizer.tokenize(istr, "test.cpp");

        // Check..
        CheckString checkString(&tokenizer, &settings, this);
        checkString.checkAlwaysTrueOrFalseStringCompare();
    }

    void alwaysTrueFalseStringCompare() {
        check("void f() {\n"
              "  if (strcmp(\"A\",\"A\")){}\n"
              "  if (strncmp(\"A\",\"A\",1)){}\n"
              "  if (strcasecmp(\"A\",\"A\")){}\n"
              "  if (strncasecmp(\"A\",\"A\",1)){}\n"
              "  if (memcmp(\"A\",\"A\",1)){}\n"
              "  if (strverscmp(\"A\",\"A\")){}\n"
              "  if (bcmp(\"A\",\"A\",1)){}\n"
              "  if (wcsncasecmp(L\"A\",L\"A\",1)){}\n"
              "  if (wcsncmp(L\"A\",L\"A\",1)){}\n"
              "  if (wmemcmp(L\"A\",L\"A\",1)){}\n"
              "  if (wcscmp(L\"A\",L\"A\")){}\n"
              "  if (wcscasecmp(L\"A\",L\"A\")){}\n"
              "}");
        ASSERT_EQUALS("[test.cpp:2]: (warning) Unnecessary comparison of static strings.\n"
                      "[test.cpp:3]: (warning) Unnecessary comparison of static strings.\n"
                      "[test.cpp:4]: (warning) Unnecessary comparison of static strings.\n"
                      "[test.cpp:5]: (warning) Unnecessary comparison of static strings.\n"
                      "[test.cpp:6]: (warning) Unnecessary comparison of static strings.\n"
                      "[test.cpp:7]: (warning) Unnecessary comparison of static strings.\n"
                      "[test.cpp:8]: (warning) Unnecessary comparison of static strings.\n"
                      "[test.cpp:9]: (warning) Unnecessary comparison of static strings.\n"
                      "[test.cpp:10]: (warning) Unnecessary comparison of static strings.\n"
                      "[test.cpp:11]: (warning) Unnecessary comparison of static strings.\n"
                      "[test.cpp:12]: (warning) Unnecessary comparison of static strings.\n"
                      "[test.cpp:13]: (warning) Unnecessary comparison of static strings.\n", errout.str());

        // avoid false positives when the address is modified #6415
        check("void f(void *p, int offset)  {\n"
              "     if (!memcmp(p, p + offset, 42)){}\n"
              "     if (!memcmp(p + offset, p, 42)){}\n"
              "     if (!memcmp(offset + p, p, 42)){}\n"
              "     if (!memcmp(p, offset + p, 42)){}\n"
              "}\n");
        ASSERT_EQUALS("", errout.str());

        // avoid false positives when the address is modified #6415
        check("void f(char *c, int offset)  {\n"
              "     if (!memcmp(c, c + offset, 42)){}\n"
              "     if (!memcmp(c + offset, c, 42)){}\n"
              "     if (!memcmp(offset + c, c, 42)){}\n"
              "     if (!memcmp(c, offset + c, 42)){}\n"
              "}\n");
        ASSERT_EQUALS("", errout.str());

        // avoid false positives when the address is modified #6415
        check("void f(std::string s, int offset)  {\n"
              "     if (!memcmp(s.c_str(), s.c_str() + offset, 42)){}\n"
              "     if (!memcmp(s.c_str() + offset, s.c_str(), 42)){}\n"
              "     if (!memcmp(offset + s.c_str(), s.c_str(), 42)){}\n"
              "     if (!memcmp(s.c_str(), offset + s.c_str(), 42)){}\n"
              "}\n");
        ASSERT_EQUALS("", errout.str());

        check_preprocess_suppress(
            "#define MACRO \"00FF00\"\n"
            "int main()\n"
            "{\n"
            "  if (strcmp(MACRO,\"00FF00\") == 0)"
            "  {"
            "    std::cout